砂岩三轴循环加卸载变形特性分析及扩容逾渗模型研究

doi:10.13722/j.cnki.jrme.2024.0251

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摘要为研究煤矿地下水库底板在经历干湿循环与采动应力扰动下的力学行为，以砂岩为研究对象，采用MTS815试验机设计干燥和饱和条件下的三轴循环加卸载试验，分析其损伤演化及破坏前后线性–非线性扩容转变过程中的突变行为特征。通过引入基于塑性体积应变定义的损伤变量，建立基于临界指数的逾渗模型，其能够描述非线性体积扩容现象。试验结果表明，在水的作用下，砂岩的脆性变形破坏被抑制，且水化作用对砂岩力学特性的弱化效应与水压有效应力原理体现的增强作用存在竞争关系。通过最大剪胀角将体积扩容划分为裂隙扩展与剪切滑移2个阶段，在干燥条件下，损伤变量在2个阶段的临界点存在突变现象，而饱和条件下则过渡平缓。在裂隙扩展阶段，建立的逾渗模型理论预测与实测数据的高度吻合，验证模型的准确性。在此基础上，结合损伤变量推导了体积应变的逾渗模型。

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	程建超1
	贾震1
	侯孟冬1
	刘升贵1
	杨欢2
	3
	刘殷彤1
	李阳4
	薛东杰1
	3

关键词 ：岩石力学, 三轴循环加卸载试验, 扩容, 剪胀角, 损伤, 逾渗模型

Abstract：To investigate the mechanical behavior of the underground reservoir?s floor in a coal mine subjected to combined dry-saturated cycling and disturbances of mining-induced stress，triaxial cyclic loading-unloading tests of sandstone under dry and saturated conditions are conducted using the MTS815 testing system，to analyze the damage evolution characteristics and the critical jumping behavior from linear to non-linear transition of dilatancy at pre- and post-failure. By introducing a damage variable dependent on the plastic volumetric strain，a critical index-based percolation model is established to describe the nonlinear dilatancy phenomenon. The experimental results show that the brittle behavior of sandstone is weakened by water saturation and a competitive relationship between the water-weakening effect and the hydraulic pressure-strengthening effect is observed. In addition，the maximum dilation angle is suggested as a criterion to divide the dilating deformation into the fracture growth and the shear-induced slippage. The damage variable?s evolution of sandstone under dry states also presents a critical jumping phenomenon at the transition boundary between two stages，while under saturation conditions it shows a gradual transition. In the fracture growth stage，the proposed percolation model fits the testing data well，which confirms the validity of proposed percolation model. Moreover，another percolation model to describe the volumetric strain evolution considering the damage variables was also derived.

Key words： rock mechanics triaxial cyclic loading-unloading test dilatancy dilation angle damage percolation model

引用本文:

程建超1，贾震1，侯孟冬1，刘升贵1，杨欢2，3，刘殷彤1，李阳4，薛东杰1，3. 砂岩三轴循环加卸载变形特性分析及扩容逾渗模型研究[J]. 岩石力学与工程学报, 2024, 43(11): 2687-2699.
CHENG Jianchao1，JIA Zhen1，HOU Mengdong1，LIU Shenggui1，YANG Huan2，3，LIU Yintong1，LI Yang4，XUE Dongjie1，3. Percolation modelling of dilation deformation evolution of sandstone under tri-axial cyclic loading-unloading. , 2024, 43(11): 2687-2699.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2024.0251 或 https://rockmech.whrsm.ac.cn/CN/Y2024/V43/I11/2687

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